"Experts say that migrations from Unix to Linux have slowed down because all the low-hanging fruit has now been picked. Linux growth in the U.S. x86 server market has, over the past six quarters, started to falter and reverse its positive course relative to Windows Server and the market as a whole."More here.

Every HP server we purchase comes blank. We push out the OS we want on it.
For example we buy fully loaded blade enclosures, 16 servers/blades per enclosure all blank. We bought 4 of them in the past 3 months. And then there are the rack servers that come blank.
I think they are cherry picking.